In the attached file I am trying to fill the 4 quadrants which make up the fifth object to the right with black or gray paint. I use the F1 tool and select one of the quadrants. When I try to fill that quadrant, only half of the quadrant is filled? Why is this? How fix? If it is relevant the 4 quadrants were created by drawing 4 bezier lines down and across a shape like the 4th to the right, and then breaking the lines at nodes.